﻿/*
 * Copyright (c) 2015-2016 Constantijn Evenhuis (blueprints@const.nl)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
using Blueprints.IO;
using System;
using System.Collections.Generic;

namespace Blueprints.Editing.Actions
{
    internal sealed class InsertElementAction : IUndoableAction
    {
        public InsertElementAction(EditNode node, int elementIndex)
        {
            Node = node;
            ElementIndex = elementIndex;

            AfterNodes = new List<EditNode>
{
new EditNode(node.EditContext, new StartNode("Item", null, null, null)),
new EditNode(node.EditContext, new EndNode()),
};
        }

        public EditNode Node
        {
            get;
            private set;
        }

        public int ElementIndex
        {
            get;
            private set;
        }

        public List<EditNode> AfterNodes
        {
            get;
            private set;
        }

        public EditNode Do()
        {
            int nodeIndex = Node.EditContext.Nodes.IndexOfElementNode(Node, ElementIndex);
            if (nodeIndex < 0)
            {
                throw new InvalidOperationException();
            }

            Node.EditContext.Nodes.InsertRange(nodeIndex, AfterNodes);
            return Node;
        }

        public EditNode Undo()
        {
            int nodeIndex = Node.EditContext.Nodes.IndexOfElementNode(Node, ElementIndex);
            if (nodeIndex < 0)
            {
                throw new InvalidOperationException();
            }

            Node.EditContext.Nodes.RemoveSubTree(nodeIndex);
            return Node;
        }
    }
}